I have also been looking for knowledge on this 3-n-1 tool. The library didn't offer much. Just old books about hvac sheetmetal work.
Take it a tool at a time. Go shopping and purchaes some roof flashing at your local.. hardware whatever. Or use any scrap that you have, 18 to 22 ga.
THE SHEAR.. It will cut anything that you can pull the handle down on. The handle can be extended by backing off the set wing nut and sliding the handle out your way. A light right at the shear upper blade will help to see the line to cut. Now take a piece of flashing and cut a strip about 3/4' wide.
THE BRAKE.. Now place that piece on the lower jaw of the brake. Center it and bring the top blade down and press it into the lower die till it stops. You have just made a boot for the top die to form alum parts. When you need it, just tape it to the upper die. If you need a bigger radious then form another on top of that one.
THE ROLLERS... Cut a strip about 2" wide and and length over 9". Push this strip between the right side of the rollers. Adjust the PINCH of the rollers with the screw at the top of the roller. Do the same to the left side. Now the roller should grab the part and pull it through as you crank the handle.
Now set the back roller. Adjust the screws on the back of the back roller. The roller must stay even side to side as you make the adjustment. Place the 2" strip in the roller and crank it in till it just passes over the back roller. Then screw the back roller in just enough to bend the strip up a little. Crank on the handle to run the strip on past the rollers and out the back. Grab it ant turn it around. Now you are going to pass it through again but from the other end. Give three turns on each screw that controls the back roller, and then crank the part through again. Each time that you turn the piece, it keeps from having a flat spot in the circle. Continue this process till you have a circle.
Now look for a book that will show you HOW TO USE A BOX AND PAN BREAK. Play with these three steps and you will be able to do most of the things that you will need.
These are great tools for the money. But if you really want to get the most out of this tool, you should take it apart and clean it up really good. File off any sharp edges, lube it and reassemble it.
Hope this helps.......................